Flash Gordon

Flash Gordon Conquers the Universe - Episode 3: Captured by Shark Men (Theatrical Release) - The film starts on Earth. A deadly plague has been ravaging the planet, known as the Purple Death because it leaves a purple spot on the forehead of its victims. Ming the Merciless is suspected to be behind the plague, and Flash Gordon is sent with Dr. Alexis Zarkov and Dale Arden to the planet Mongo to find the cause of the plague, as well as a cure.